The #961 PS I use with an OMNI VI has a ground lug. The switching PS that comes with the IC-746PRO, and an Astron switcher I own do not. Why the ground lug on the 961? Is it a case of belt-and-suspenders? Or do linear PS's need a direct ground while switchers do not? Doesn't make sense to me given the propensity of switchers to emit RF noise. 73, John, W3ULS